Input validation error in Atlassian Crowd

1) Input validation error

EUVDB-ID: #VU39994

Risk: High

CVSSv4.0: 8.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2016-6496

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote non-authenticated attacker to execute arbitrary code.

The LDAP directory connector in Atlassian Crowd before 2.8.8 and 2.9.x before 2.9.5 allows remote attackers to execute arbitrary code via an LDAP attribute with a crafted serialized Java object, aka LDAP entry poisoning.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Crowd: 2.9.0 - 2.9.1

CPE2.3

• cpe:2.3:a:atlassian:crowd:2.9.0:*:*:*:*:*:*:*
• cpe:2.3:a:atlassian:crowd:2.9.1:*:*:*:*:*:*:*

External links

https://www.securityfocus.com/archive/1/539655/100/0/threaded
https://www.securityfocus.com/bid/93826
https://confluence.atlassian.com/crowd/crowd-security-advisory-2016-10-19-856697283.html
https://jira.atlassian.com/browse/CWD-4790
https://www.blackhat.com/docs/us-16/materials/us-16-Munoz-A-Journey-From-JNDI-LDAP-Manipulation-To-RCE-wp.pdf

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.